Franken looked shaken as he walked up to a makeshift stand of microphones before a crowd of reporters and television cameras crammed into the landing outside his office in Hart Senate Office Building.

“I know that I’ve let a lot of people down: [the] people of Minnesota, my colleagues, my staff, my supporters and everyone who has counted on me to be a champion for women,” he said amid a blizzard of camera clicks. “To all of you I just want to again say I’m sorry.”

A spokesman for Credo said Monday that the group didn’t have anything to say when asked whether Franken had taken adequate responsibility with his apologies.

Franken says he will cooperate fully with a Senate ethics investigation and has acknowledged that other accusations may come to light in the coming weeks.

“If you had asked me two weeks ago would any woman come forward with an allegation like this I would have said no, and so I cannot speculate,” he said. “This has been a shock.”

“What I’m going to do is I’m going to start my job and go back to work,” he added.

Franken reiterated a defense rolled out over the weekend in interviews with Minnesota-based media outlets that he did not recall touching or grabbing the buttocks of several women — but he didn’t specifically deny the claims of his accusers, either.

He said he has posed for thousands of pictures and did not remember ever letting his hand slide below the waist of a woman who asked for a photo.

“From these stories it’s been clear that there are some women, and one is too many, who feel that I’ve done something disrespectful and that’s hurt them and for that I’m tremendously sorry,” he said.

“I know I am going to have to be much more conscious when in these circumstances, much more careful, much more sensitive, and that this will not happen again going forward,” he added.

He said he would be open to making the findings of the ethics panel public.

In response to his first accuser, radio host Leeann Tweeden, who claimed Franken forced his tongue into her mouth while rehearsing a USO skit in 2006, Franken said he had a different recollection.

“But I feel you have to respect women’s experience and so I apologized to her and meant it,” he said, noting that she accepted the apology.

If more women come forward with claims of sexual misconduct or if investigators unearth other explosive details, Franken could ultimately face an expulsion vote — which would require a two-thirds majority of the Senate — although the chance of that seems remote at this point.

The Minnesota lawmaker declined to say what kind of behavior would demand a resignation.

It could also make it more difficult for him to co-sponsor legislation as colleagues or interest groups are leery of associating with him, at least in the near future.

Franken pulled his name off a rape survivors bill two weeks ago after one of its leading advocates, Abby Honold, a former University of Minnesota student, said she didn’t want anything to do with him.

A Democratic senator who requested anonymity to comment on Franken’s political future says a lot will depend on the Senate Ethics Committee.

“I hope he continues to serve but if the ethics investigation comes back bad, he’ll have to be held accountable,” the lawmaker said.

Franken, a popular Democratic fundraiser, had been seen as a dark horse candidate for president in 2020. Now Democratic strategists say Franken’s political future is cloudy and there are questions about his ability to remain an effective spokesman for the causes he cares about.

“The question now is whether he can be effective in the Senate. I think he can but if any more allegations come out, he will find himself in a very tough spot,” said Jim Manley, a Democratic strategist and former senior Senate aide.